Intrinsic cascade-free intramode scattering Brillouin laser

Abstract

The cascade operation of Brillouin lasers (BLs) is an identified obstacle to single-frequency power scaling and further compression of the fundamental linewidth. In this study, we reveal the relationship between the maximum cascade order and system parameters, starting from the phase-matching conditions of the Stokes cascade. The second Stokes is suppressed for modes that fall away the Brillouin gain linewidth (ΓB), which is heightened for Brillouin gain media with high sound velocity, large refractive index, and narrow linewidth. Diamond, with its extremely high product of speed of sound and refractive index, satisfies these requirements and is found to achieve cascade-free intramode scattering (TEM00) without manipulating cavity mode structures. This study elucidates a route to single-frequency, narrow-linewidth BLs via Brillouin material selection.

Passive Phase Locking Coherent Combination of Solid-State Lasers through Stimulated Brillouin Scattering Effect

“…When the input voltage is set to 900 V, the pump energy is 428 mJ, the Stokes energy is 388 mJ, and the energy reflectivity is 90.7%. Moreover, the beam profile of the injected pump light was improved to some extent via the action of SBS-PCM, and the energy distribution of the laser spot output became more uniform [20,21].…”

“…When the input voltage is set to 900 V, the pump energy is 428 mJ, the Stokes energy is 388 mJ, and the energy reflectivity is 90.7%. Moreover, the beam profile of the injected pump light was improved to some extent via the action of SBS-PCM, and the energy distribution of the laser spot output became more uniform [20,21]. In the Stokes light amplification experiment, the generated Stokes beam is separately injected into two amplification cells for amplification, and the injected Stokes light is amplified by extracting the energy from the injected pump light; the energy change in the two is shown in Figure 6.…”